1. In a quiz team A scored -30, 20, 40, -15 and team B scored -40, -20, 30,25 in four sucoessive rounds. Which team scored more?

2. Write down a pair of integers whose:
a) Sum is -30
b) Difference is -15
c) Multiplication is 40
d) Multiplication is -40

3. Find the product using suitable properties
a) 25 x (-19) + (-19) x 5
b) (-81) x 20 + 81
c) 6 x (40 – 5)
d) (-125) x 29 x 4
e) (-19) x (-49)

4. Verify the following:
a) 15 x [8+(-2)] = 15 x 8 + 15 x (-2)
b) a= 28, b= 81, then a-(-b) = a+b.

5. In a class test containing 20 questions, 4 marks are given for every correct answer and (-2) marks are given for every incorrect answer. a) Evan attempts all questions but only 18 of her answers are correct. What is her total score? b) One of her friends gets only 10 answers correct. What will be her score?

6. Anna is a microbiology student. She was doing research on optimum temperature for the survival of different strains of bacteria. Studies showed that bacteria X need optimum temperature of -31⁰C while bacteria Y need optimum temperature of -56⁰C. What is the temperature difference?